For me was a really old game called 7th guest, th game drove me nuts with how insane the puzzles were but eventually beat it, followed by its sequel 11th hour, the rerelease just wasn't the same... Too easy

close tie between a few games on the SNES, maybe mega man X, or one of the donkey kong countries, maybe even this weird stone-age game sidescroller where u run around as a cave man, collecting power ups, and kill dinosaurs etc, and at the end of every lvl u beat a woman in a bikini comes and kisses u, god knows the name of that game